某地区工程水文地质条件勘察分析

Exploration and Analysis of Engineering Hydrogeological Conditions in a Certain Area

供水工程是保障居民生活和经济发展的重要基础设施,为解决某新建供水工程的水文地质问题,通过地质勘察分析环境水对建筑混凝土结构、钢筋、钢结构的腐蚀性及场地砂土液化、各土层渗透性及土层开挖参数,结果表明,场区内地表水和地下水对钢结构、混凝土结构及混凝土中的钢筋分别具有弱腐蚀性、中等腐蚀性和无腐蚀性;管道铺设线路上土体对钢结构有着微~强的腐蚀性,因此在工程建设时应对输水管道实施防腐措施;局部细砂层为液化土层,需进行抗地震液化处理;砂砾卵石(3-5)层和中粗砂、粗砂(3-4)层属于管涌型渗透变形;淤质中砂层、淤质黏土层和淤泥质黏土层土质较差,开挖时不宜采取放坡开挖,应及时设置钢板桩等相应的支护措施。

Water supply engineering is an important infrastructure for ensuring the daily life and economic development of residents.In order to solve the hydrogeological problems related to a newly built water supply engineering,geological exploration was conducted to analyze the corrosiveness of environmental water on building concrete structures,steel bars,and steel structures.The liquefaction of sand and soil on site,permeability of each soil layer,and excavation parameters of soil layers were also analyzed.The research results showed that surface water and groundwater in the site,concrete structures and steel bars in concrete have weak corrosion,moderate corrosion,and no corrosion,respectively.The soil on the pipeline laying route has a slight to strong corrosiveness to the steel structure,so anti-corrosion measures should be implemented for water transmission pipelines during engineering construction.Local fine sand layers are liquefied soil layers that require seismic liquefaction resistance treatment.The sand gravel(3-5)layer and the medium coarse sand and coarse sand(3-4)layer belong to the piping type infiltration deformation.The sand layer,clay layer,and muddy clay layer in the silted soil have poor soil quality.Slope excavation should not be adopted during excavation,and corresponding support measures,such as steel sheet piles,should be set up in a timely manner.